AVIA Women's GFC Impact Cross-Trainer Shoe 100% Air Mesh/Synthetic Overlays Imported Rubber sole Shaft measures approximately 2.1" from arch Lightweight air mesh upper with seamless synthetic overlays for enhanced breathability and flexibility. Dual durometer compression molded eva midsole, featuring gelfom cantilever (gfc) for superior cushioning. Molded removable super gelfom sock liner. Lightweight, solid rubber outsole with forefoot flex grooves for flexibility and forefoot outrigger for extra lateral stability.